<button class="btn-upload" [disabled]="!documentId">
    <nz-progress
        [nzPercent]="uploader.progress"
        nzType="circle"
        [nzWidth]="60"
        *ngIf="isUploading"
        [hidden]="uploader.progress === 0"
    ></nz-progress>
    <ng-container *ngIf="!isUploading">
        <input type="file" ng2FileSelect [uploader]="uploader" (change)="selectedFileOnChanged($event)" [disabled]="!documentId" multiple />
        <i class="anticon anticon-plus"></i>
        <span>点击上传</span>
    </ng-container>
</button>
